The enthalpy and entropy of a reaction are - 5 . 0 kJ / mol and - 20 J K - 1 m o l - 1 respectively and are independent of temperature. What is the highest temperature upto which the reaction is feasi

Question

The enthalpy and entropy of a reaction are - 5 . 0 kJ / mol and - 20 J K - 1 m o l - 1 respectively and are independent of temperature. What is the highest temperature upto which the reaction is feasible?

TestHub · Accepted Answer

Both Δ H and Δ S are negative and, therefore, the given reaction will be spontaneous ( Δ G < 0 ) if Δ H - T Δ S < 0 or - 5.0 k J - T ( - 20 J K - 1 ) < 0 or - 5.0 × 1 0 3 J + T ( 20 J K - 1 ) < 0 i.e., T < 5 × 1 0 3 J 20 J K - 1 < 250 K .

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